Cyperaceae taxon details
Bulbostylis itremoensis Lye ex Rasam.
1678738 (urn:lsid:marinespecies.org:taxname:1678738)
accepted
Species
terrestrial
Rasaminirina, F.; Rakotoarimanana, V.; Ralimanana, H.; Rabehevitra, D.; Larridon, I. (2022). Bulbostylis itremoensis (Abildgaardieae, Cyperaceae), a new sedge species from Madagascar. <em>Kew Bulletin.</em> 77(1): 301-308., available online at https://doi.org/10.1007/s12225-022-10014-7
page(s): 302 [details] Available for editors
[request]
page(s): 302 [details] Available for editors
[request]
Holotype P 01868145, geounit Madagascar
Holotype P 01868145, geounit Madagascar [details]
Description A densely tussocky perennial with numerous crowded culms, leaves and 0.5 – 2.0 mm thick, soft roots with an outer...
Etymology The species has mostly been found and collected from the Itremo Massif, and Lye originally thought it was endemic to this...
LSID urn:lsid:ipni.org:names:77295612-1
Description A densely tussocky perennial with numerous crowded culms, leaves and 0.5 – 2.0 mm thick, soft roots with an outer mycorrhizal layer. Culms 5 – 20 cm long and 0.3 – 0.6 mm thick, angular to almost terete with about 10 rounded longitudinal ridges and without conspicuous surface cells, with few – numerous, 0.3 – 0.7 mm long spreading or somewhat adpressed whitish hairs (on old culms with mature nutlets almost all the hairs are sometimes torn away); the lower part of the plant is usually densely white-woolly: the basal prophylls about 10 mm long, reddish-brown with two prominent scabrid ribs. Leaves from the lower 4 cm only and 4 – 6 leaves per culm; sheaths light brown (ferrugineus) to straw-coloured with numerous longitudinal nerves, densely short-hairy on the nerves (hairs 0.2 mm long), but with numerous 2 – 4 mm long flexuose whitish hairs at their oblique orifices; blades to 10 cm long and 0.3 – 0.6 mm wide, flat when wet, but strongly incurved when dry, with 3 – 5 longitudinal nerves on lower surface and no nerves on upper surface, which has about 10 longitudinal cell rows, scabrid to short-hairy particularly on margin; large rectangular surface cells often prominent on both surfaces. Inflorescence is a dense hemispherical head to about 10 mm in diam. consisting of c. 15 crowded spikelets, but young developing inflorescences may appear as being composed of a few spikelets only; occasionally one of the spikelets is set on an up to 7 mm long peduncle. Involucral bracts many, at least one (often 2 – 3) conspicuous with green midrib excurrent into a green scabrid leaf-like blade longer than the inflorescence; the largest 5 – 20 mm long, erect or spreading; its basal part, however, glume-like, reddish-brown with numerous long flexuose hairs along its margins. Spikelets 3 – 5 mm long and 1.5 – 2.5 mm long. Scale below glume absent. Glumes 3.0 – 4.0 mm long and 1.0 – 1.5 mm wide, ovate, densely scabrid (hairs 30 – 40 μm long), but up to 120 μm long hairs on margin, medium reddish-brown with no lateral nerves, but with a prominent 1 – 3-nerved green midrib ending below the obtuse apex or (in the lower-most glumes) excurrent into a short mucro; epidermis cells of glumes elongate and rectangular, mostly 30 – 60 μm long and 15 – 20 μm wide, with prominently sinuate cell walls; more than half of the cells strongly cutinised, other cells with 5 – 15 prominent papillae with satellites. Stamens 3, filaments about 4 mm long and 0.1 – 0.2 mm wide, flattened whitish to light reddish-brown; anther about 2.5 mm long and 0.6 – 0.7 mm wide, light reddish-brown (after anthesis) with the connective excurrent into a prominent about 0.2 mm long darker (reddish-brown) acute mucro; the four basal horns about 0.1 mm long, of the same colour as the anther. Style about 4 mm long, medium reddish-brown and ending in three 2.0 – 2.5 mm long papillose stigmas of the same colour as the lower part of the style. Nutlet 0.9 – 1.0 mm long and 0.6 – 0.7 mm wide, obovate, obtusely triangular, pale grey to light reddish-brown with a dark reddish-brown persistent style base, with 5 – 10 transverse wrinkles on each of the three sides; the angles prominent, papillose; outermost cells to pericarp linear with sinuate cell walls, 90 – 120 μm long to 20 μm wide, with a prominent papilla in the centre of each cell (top of wrinkle); the style base persisting on the mature nutlet as a flattened reddish-brown knob about 0.15 mm wide and 1.0 mm long. [details]
Etymology The species has mostly been found and collected from the Itremo Massif, and Lye originally thought it was endemic to this...
Etymology The species has mostly been found and collected from the Itremo Massif, and Lye originally thought it was endemic to this area, hence he suggested the species epithet “itremoensis”. [details]
LSID urn:lsid:ipni.org:names:77295612-1
LSID urn:lsid:ipni.org:names:77295612-1 [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Bulbostylis itremoensis Lye ex Rasam.. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1678738 on 2025-09-13
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2024-12-10 11:47:54Z
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Nomenclature
original description
Rasaminirina, F.; Rakotoarimanana, V.; Ralimanana, H.; Rabehevitra, D.; Larridon, I. (2022). Bulbostylis itremoensis (Abildgaardieae, Cyperaceae), a new sedge species from Madagascar. <em>Kew Bulletin.</em> 77(1): 301-308., available online at https://doi.org/10.1007/s12225-022-10014-7
page(s): 302 [details] Available for editors [request]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
page(s): 302 [details] Available for editors
[request]basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
Present Inaccurate Introduced: alien Containing type locality
Holotype P 01868145, geounit Madagascar [details]
Isotype MO 2589140, geounit Madagascar [details]
Isotype TAN, geounit Madagascar [details]
From editor or global species database
Description A densely tussocky perennial with numerous crowded culms, leaves and 0.5 – 2.0 mm thick, soft roots with an outer mycorrhizal layer. Culms 5 – 20 cm long and 0.3 – 0.6 mm thick, angular to almost terete with about 10 rounded longitudinal ridges and without conspicuous surface cells, with few – numerous, 0.3 – 0.7 mm long spreading or somewhat adpressed whitish hairs (on old culms with mature nutlets almost all the hairs are sometimes torn away); the lower part of the plant is usually densely white-woolly: the basal prophylls about 10 mm long, reddish-brown with two prominent scabrid ribs. Leaves from the lower 4 cm only and 4 – 6 leaves per culm; sheaths light brown (ferrugineus) to straw-coloured with numerous longitudinal nerves, densely short-hairy on the nerves (hairs 0.2 mm long), but with numerous 2 – 4 mm long flexuose whitish hairs at their oblique orifices; blades to 10 cm long and 0.3 – 0.6 mm wide, flat when wet, but strongly incurved when dry, with 3 – 5 longitudinal nerves on lower surface and no nerves on upper surface, which has about 10 longitudinal cell rows, scabrid to short-hairy particularly on margin; large rectangular surface cells often prominent on both surfaces. Inflorescence is a dense hemispherical head to about 10 mm in diam. consisting of c. 15 crowded spikelets, but young developing inflorescences may appear as being composed of a few spikelets only; occasionally one of the spikelets is set on an up to 7 mm long peduncle. Involucral bracts many, at least one (often 2 – 3) conspicuous with green midrib excurrent into a green scabrid leaf-like blade longer than the inflorescence; the largest 5 – 20 mm long, erect or spreading; its basal part, however, glume-like, reddish-brown with numerous long flexuose hairs along its margins. Spikelets 3 – 5 mm long and 1.5 – 2.5 mm long. Scale below glume absent. Glumes 3.0 – 4.0 mm long and 1.0 – 1.5 mm wide, ovate, densely scabrid (hairs 30 – 40 μm long), but up to 120 μm long hairs on margin, medium reddish-brown with no lateral nerves, but with a prominent 1 – 3-nerved green midrib ending below the obtuse apex or (in the lower-most glumes) excurrent into a short mucro; epidermis cells of glumes elongate and rectangular, mostly 30 – 60 μm long and 15 – 20 μm wide, with prominently sinuate cell walls; more than half of the cells strongly cutinised, other cells with 5 – 15 prominent papillae with satellites. Stamens 3, filaments about 4 mm long and 0.1 – 0.2 mm wide, flattened whitish to light reddish-brown; anther about 2.5 mm long and 0.6 – 0.7 mm wide, light reddish-brown (after anthesis) with the connective excurrent into a prominent about 0.2 mm long darker (reddish-brown) acute mucro; the four basal horns about 0.1 mm long, of the same colour as the anther. Style about 4 mm long, medium reddish-brown and ending in three 2.0 – 2.5 mm long papillose stigmas of the same colour as the lower part of the style. Nutlet 0.9 – 1.0 mm long and 0.6 – 0.7 mm wide, obovate, obtusely triangular, pale grey to light reddish-brown with a dark reddish-brown persistent style base, with 5 – 10 transverse wrinkles on each of the three sides; the angles prominent, papillose; outermost cells to pericarp linear with sinuate cell walls, 90 – 120 μm long to 20 μm wide, with a prominent papilla in the centre of each cell (top of wrinkle); the style base persisting on the mature nutlet as a flattened reddish-brown knob about 0.15 mm wide and 1.0 mm long. [details]Etymology The species has mostly been found and collected from the Itremo Massif, and Lye originally thought it was endemic to this area, hence he suggested the species epithet “itremoensis”. [details]
LSID urn:lsid:ipni.org:names:77295612-1 [details]
